Man is a wanting animal - as ...

Man is a wanting animal - as soon as one of his needs is satisfied, another appears in its place. This process is unending. It continues from birth to death.
 Douglas McGregor

Quotes from the same author

Then it becomes necessary to get the field organisation to accept the help provided. This is normally the role of the Change Manager; to implement the change that no-one asked for or wants.
 Douglas McGregor